APA aipamena

H G Zandstra. (1981). A methodology for on-farm cropping systems research. Philippines: IRRI.

Chicago Style aipamena

H G Zandstra. A Methodology for On-farm Cropping Systems Research. Philippines: IRRI, 1981.

MLA aipamena

H G Zandstra. A Methodology for On-farm Cropping Systems Research. Philippines: IRRI, 1981.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.